/*  * Name      : ch1-03.c * Purpose   : Demonstration of variable length outputs * Author    : Tom St Denis * * History   : v0.79 Initial release */  /* ch1-01-1 */ #include <mycrypt.h>  int main(void) {    unsigned long length;    unsigned char buffer[512];    int errno;        length = sizeof(buffer);    if ((errno = some_func(..., buffer, &length)) != CRYPT_OK) {       printf("Error: %s\n", error_to_string(errno));       return EXIT_FAILURE;    }    printf("Size of output is %lu bytes\n", length);    return 0;}/* ch1-01-1 */